摘要
本试验旨在研究不同中性洗涤纤维(NDF)与非纤维性碳水化合物(NFC)比值(NDF/NFC)饲粮对肉用绵羊甲烷排放的影响。试验采用4×4完全拉丁方试验设计,将16只杜泊×小尾寒羊杂交羯羊随机分成4组,每组4只,按维持水平饲喂NDF/NFC分别为3.02(饲粮1)、2.32(饲粮2)、1.58(饲粮3)、1.04(饲粮4)的全混合颗粒饲粮(玉米秸秆为粗饲料来源)。试验共进行4期,每期18 d,包括3 d的调整期、7 d的预试期和8 d的正试期,在正试期内测定甲烷产量、饲粮总能和营养物质表观消化率。结果表明:饲粮2的甲烷日排放量显著高于饲粮3和4(43.43 L/d vs.38.88和35.98 L/d;P<0.05)。与饲粮1相比,饲粮2和3的每千克干物质采食量(DMI)甲烷排放量显著增加(38.00 L/kg DMI vs.42.24、41.69 L/kg DMI;P<0.05),但是饲粮2、3和4之间差异不显著(P>0.05)。随着NDF/NFC的降低,每千克可消化有机物(DOM)的甲烷排放量逐渐降低,饲粮4的每千克DOM的甲烷排放量显著低于饲粮1、2和3(58.78 L/kg DOM vs.75.00、73.35和64.11 L/kg DOM;P<0.05)。随着NDF/NFC的降低,每千克中性洗涤纤维采食量(NDFI)或酸性洗涤纤维采食量(ADFI)的甲烷排放量逐渐增加,且各饲粮之间差异显著(P<0.05)。综上所述,结合各营养物质表观消化率和甲烷排放效率,在维持水平下,采用NDF/NFC为1.04的玉米秸秆饲粮作为肉用绵羊甲烷减排的饲粮最合适。
This study investigated the effects of different neutral detergent fiber/nonfiberous carbohydrate （NDF/NFC） diets on methane emission of meat sheep. The trial was conducted according to a 4 x 4 Latin square design： 16 Dorperxthin tailed Han crossbred wethers were randomly divided into 4 groups with 4 sheep each, and each group was randomly fed one of four total mixed pellet diets （ corn stalk as the source of rough- age） with the NDF/NFC of 3.02 （diet 1）, 2.32 （diet 2）, 1.58 （diet 3） and 1.04 （diet 4） at maintenance level, respectively. The trial included 4 periods with each lasted for 18 days, and the first 3 days of each period was an adjustment period, the following 7 days was a pretrial period and the last 8 days was an experimental period. Methane emission and the apparent digestibility of gross energy and nutrients of diets were measured in the experimental period. The results showed that the methane （ CH4 ） daily emission of sheep fed the diet 2 was significantly higher than that of those fed diets 3 and 4 （43.43 L/d vs. 38.88 and 35.98 L/d; P〈0.05）. Com- pared with the sheep fed diet 1, the methane emission of per kg dry matter intake （DMI） of sheep fed diets 2 and 3 was significantly increased （38.00 L/kg DMI vs. 42.24 and 41.69 L/kg DMI; P〈0.05）, but no signifi- cant difference was observed among sheep fed diets 2, 3 and 4 （P〉0.05）. With the NDF/NFC decrease, the methane emission of per kg digestible organic matter （DOM） was gradually decreased, and sheep fed the diet 4 was significantly lower than sheep fed diets 1, 2 and 3 （58.78 L/kg DOM vs. 75：00, 73.35 and 64.11 L/kg DOM; P〈0.05）. The methane emissions of neutral detergent fiber intake （NDFI） or acid deter- gent fiber intake （ADFI） were gradually increased with the NDF/NFC decrease, and the difference among sheep fed four diets was significant （P〈0.05）. In summary, combining with the apparent digestibility of nutri- ents and methane emission efficiency, the corn stalk die
出处
《动物营养学报》
CAS
CSCD
北大核心
2017年第3期806-813,共8页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
国家自然科学基金“绵羊甲烷排放的粪便反射特征光谱研究”(41475126)
国家科技支撑计划项目子课题“农区肉羊健康养殖模式构建与示范”(2012BAD39B05-3)
